Long-Term Tillage and Crop Rotation Impacts on a Northern Great Plainsmollisol · Knowledge Library

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Long-Term Tillage and Crop Rotation Impacts on a Northern Great Plainsmollisol · Knowledge Library

available K

↑ 1↓ 2= 25

no effect
no till (NT) vs. conventional till (CT)not significant · 0–15 cm · 1991–2004 pooled · Southeast Research Farm
Numbers
- treatment 359 vs. control 347 mg kg-1 (+3.458 %)
Source · p. 5
“The K concentration was not significantly different under NT and CT”
decrease
three year rotation of corn-soybean-wheat vs. two year rotation of corn-soybeansignificant · 0–15 cm · 1991–2004 pooled · Southeast Research Farm
Numbers
- treatment 340 vs. control 365 mg kg-1 (-6.849 %)
Source · p. 5
“which was significantly different from the other two rotations”
Source · p. 5
“the 3-year-rotation had the lowest K concentration compared with the other two rotations.”
no effect
four year rotation of corn-soybean-wheat-alfalfa vs. two year rotation of corn-soybeannot significant · 0–15 cm · 1991–2004 pooled · Southeast Research Farm
Numbers
- treatment 357 vs. control 365 mg kg-1 (-2.192 %)
Source · p. 5
“there was no significant difference between its concentration in the 2-year-rotation (365 mg kg-1) and 4-yearrotation (357 mg kg-1) (Figure 5B).”
increase
no till (NT) vs. conventional till (CT)significant · 0–15 cm · 1994,1995,1997 · Southeast Research Farm · Authors note higher initial K under NT as potential confound
Numbers
- treatment 412 vs. control 336 mg kg-1 (+22.62 %) · 1994
- treatment 472 vs. control 364 mg kg-1 (+29.67 %) · 1995
- treatment 372 vs. control 317 mg kg-1 (+17.35 %) · 1997
Source · p. 4
“In each separate year within the 4-yearrotation, K concentration was significantly higher under NT than that under CT in 1994, 1995, and 1997.”
decrease
three year rotation of corn-soybean-wheat vs. four year rotation of corn-soybean-wheat-alfalfasignificant · 0–15 cm · 1991-2004 pooled · Southeast Research Farm · Across NT and CT tillage systems; Results and Conclusions identify three-year rotation, correcting abstract's two-year label
Numbers
- treatment 340 vs. control 357 mg kg-1 (-4.762 %) · 0–15 cm · 1991-2004 pooled
Source · p. 5
“the 3-year-rotation had the lowest concentration of available K (340 mg kg”
Source · p. 5
“which was significantly different from the other two rotations”
Source · p. 5
“the 3-year-rotation had the lowest K concentration compared with the other two rotations.”

available phosphorus

↑ 1↓ 34

increase
no till (NT) vs. conventional till (CT)significant · 0–15 cm · 1991–2004 pooled · Southeast Research Farm · Across rotations; strongest annual differences in4-year rotation
Numbers
- treatment 208 vs. control 191 mg kg-1 (+8.901 %)
Source · p. 3
“Averaged across all the years, the available P concentrations under”
Source · p. 3
“NT vs CT systems were significantly different.”
Source · p. 5
“Soil P concentration under NT was significantly higher compared with that under CT.”
decrease
three year rotation of corn-soybean-wheat vs. two year rotation of corn-soybeansignificant · 0–15 cm · 1991–2004 pooled · Southeast Research Farm
Numbers
- treatment 211 vs. control 236 mg kg-1 (-10.59 %)
Source · p. 3
“was significantly higher than that under the 3-year-rotation of 211 mg kg-1, which was higher than that of 172 mg kg-1 under the 4-year-rotation (Figure 3B)”
decrease
four year rotation of corn-soybean-wheat-alfalfa vs. two year rotation of corn-soybeansignificant · 0–15 cm · 1991–2004 pooled · Southeast Research Farm
Numbers
- treatment 172 vs. control 236 mg kg-1 (-27.12 %)
Source · p. 3
“Available P concentrations differed significantly among all of the”
Source · p. 3
“three crop rotations.”
Source · p. 5
“The 2-year-rotation had the highest P concentration followed by the 3-year-rotaion, and the lowest concentration was observed in the 4-year-rotation.”
decrease
four year rotation of corn-soybean-wheat-alfalfa vs. three year rotation of corn-soybean-wheatsignificant · 0–15 cm · 1991-2004 pooled · Southeast Research Farm · Across NT and CT tillage systems
Numbers
- treatment 172 vs. control 211 mg kg-1 (-18.48 %) · 0–15 cm · 1991-2004 pooled
Source · p. 3
“Available P concentrations differed significantly among all of the”
Source · p. 3
“three crop rotations.”
Source · p. 3
“was significantly higher than that under the 3-year-rotation of 211 mg kg-1, which was higher than that of 172 mg kg-1 under the 4-year-rotation (Figure 3B)”